Improvement in bellows



UNITED STATES PATENT QEEIGE.

MICHAEL DovLE, or NEW YORK, N. Y.

IMPROVEMENT IN BELLOWS.

Specification forming part of Letters Patent No. 157,910, dated December22, 1874; application filed August 24, 1874.

To all whom it may concern:

Be it known that I, MICHAEL DoYLE, of the city, county, and State of NewYork, have invented certain new and useful Improvements in Bellows, ofwhich the following is a specification, reference being had to theaccompanying drawing, in which- Figure l is a perspective view of abellows embodying my invention. Fig. 2 is a vertical central sectionmofthe same.

The bellows in which my invention is comprised is double-acting, inorder to maintain' a continuous blast of air. I employ a stationary orfixed center diaphragm, A, with exterior movable plates B G, connectedwith the center diaphragm or plate by side Walls of leather or otherpliable material, D, thus forming a chamber, a, on each side of thecenter plate. The plates B C are not hinged to the center plate, and donot vibrate on an axis; but they reciprocate bodily toward and away fromthe center plate.

This arrangement enables me to obtain air-chambers of requisitecapacity, and yet economize space, bringing the bellows within a smallercompass than would otherwise be practicable.

The center plate is fixed to a frame, E, and the two movable plates B Oare provided on each side with guides b, which move in vertical guideopenings or grooves in the fraine, and thus assure the position of themoving parts of the bellows. The upper and lower plates B C also areconnected by rods c, or their equivalents, so that the two shall move inunison, their arrangement being such that, when the one chamber, a, iscollapsed and contracted, the other chamber, a, will be eX- tended.

Ihe movement of the bellows in the present instance is eected bylever-handle F, pivoted to the frame E, and connected by a link orjointed rod with the upper plate G.

Air is supplied to thelower chamber through iiap-valves d in the plateB. The air-supply of the upper chamber a is, in this instance, through apassage, e, in the center plate A, which is controlled by aiiap-valve,f. The air from both chambers is discharged through a commonoutlet, g, formed in center partitionplate, with which outlet thechambers communicate through openings h. These openings are controlledby a single disk or puppet valve, i, which plays up and down in anintermediate valve-chamber, j, formed in the plate A between the twoopenings 11,. This valve, operated by differences in the airpressures inthe two chambers a during the movement of the bellows, alternately risesand falls, and thus throws alternately each chamber a into communicationwith the outlet g.

By means of the above-described construction and arrangement of parts apractically con tinuous and uniform blast will be obtained.

The apparatus is not only effective but cheap, simple, and little liableto get out of order, and it occupies but little space.

What I claim, and desire to secure by Letters Patent, is-

The combination of the guided exterior plates of the two airchambersofthe bellows, reciprocating bodily toward and away from the centerpartition or plate, as described, with the center partition or plate,having air-outlet g and openings h, controlled by the intermediate valvez', as herein shown-and set forth.

In testimony whereof I have hereunto signed my name this 19th day ofAugust, A. l). 1874.

MICHAEL DOYLE. Witnesses:

R. S. HAYWARD, CHARLES E. EDLING.

